Glossary
Definition. Selective disclosure is a privacy technique that lets the holder of a set of data or credentials reveal only the specific facts a counterparty needs, while keeping every other attribute hidden, for example proving a VAT rate was applied without showing each invoice line.
Selective disclosure answers a simple question: how do you prove one thing without revealing everything? A familiar analogy is proving you are over eighteen without showing your full identity document, which also carries your name, address and date of birth. Selective disclosure lets the holder present just the relevant fact, verified and trustworthy, while the rest stays private.
Technically it is a core member of the privacy-enhancing technologies family, closely linked to verifiable credentials and zero-knowledge proofs. A credential can be issued so that its holder later discloses only chosen attributes, and the verifier can still check that the disclosed fact is authentic and unaltered. Frameworks such as the EU's eIDAS2 digital identity wallets are built to support exactly this pattern, so that citizens and businesses can prove attributes across the EU without oversharing.
In taxation, selective disclosure is what makes embedded compliance proportionate. An authority carrying out real-time verification does not need every commercial detail; it needs assurance that the correct tax was calculated and paid. A business can prove the right VAT rate was applied and remitted without exposing its full ledger of prices, customers and margins. Cross-border, one administration can confirm that tax has been settled without receiving another jurisdiction's complete dataset.
Selective disclosure matters because it turns the privacy-versus-oversight debate into a design choice rather than a stand-off. The honest nuance is that revealing a fact can still leak information if the surrounding context is narrow enough to single someone out, so selective disclosure works best as part of a wider design that also minimises what is asked for in the first place and monitors for indirect re-identification.